Coke-screen.



A. e. MCKEE.

COKE SCREEN.

APPLHIATION FILED JUNE !6. l9l6- Patented Aug. 13, 1918.

| 1 1 b r [Ill lllll m i,275,713. I e i Specification of Letters. Patent.

EN it Patented Aug. its, 1918.

f Applicatio nffled june 15,1 s ria ne ioailo.

To, all whom eotm- Beit known that I, ARTHUR: G. MCKEE, a

citizenv of the United States, resident of.

Cleveland, county of Cuyahoga, .aiidfState of Ohio, have invented new andnseful 1 Improvement in Coke-Screens, of which the following is aspecification, the principle of the invention being herein explained and the best mode in which I have contein alated applyi g that principle, so as to distinguish it from other inventions. a

e w My invention relates to devices for screern coke or the like and especially to that type of: coke screens knownin the art as cascade screens. a

y 7 The object of the inventien is provide a screen of: the aloove-descrihed character which will be econoniical of construction and efliclent in its operation.

1A specific object is toso arrangethe parts 1 thatclogging will be minimized and the material thus efliciently screened ,1 so I that e a HIZIXIIDUID effective screening area may be obtained for a given areaof screcn;"ai1d so that they willperniit thelscreenj bars to be readily and quickly removed, whereby the device may be used for screening the coke used for charging blast furnaces, it being understood that in blast furnace practice,

the furnace must operate continuously and hence no} material lnterrupt on ,1n the screening operat on is permitted.

The saidfinvention consists of means hereforth inthe claims e p, e The annexed drawingjand the following inafter fully describedy'and particularly set description set forth in detail certain means embodying invention, the disclosed rne'ans, however, 301 1Sli1t 11't1i1g but one of var-1011s mechan cal forms in which the pr nciple ofthe invention may be applied.

f a? fragmentary portion or; a cokebin to whichrny iniprovedscreen has been applied. Fig.2 represents aplan of a1 fragmentary Fg. 3 represents a vertical section of a fragmentary portlon of thefscreeinng bar In said annexed drawings-- e i Figur 1 represents a'vert cal section of 1 portion of the screen.

supportshowing one of "he bars side elevation thereon, and in full.

Fig. 4; represents a plan of one ofYsaid Fig. 5 represents anendviewbfoneof y In :1 the illustrated embodiment of invention,.tl1e latter is applied toja coke bin Qfany desired construction, provided with an inclined bottom frontWallQ pro- ,vided with an opening 3 and side walls 4, as will befunderstoodh The usual Wearing plate. 5. is provided immediately above the upper end of the screen, and side-members Gare, suitably secured laterally of the opening. 3 and inclose laterally that portion of theiscreen projecting from the bin. H

Having their upperends suitably secured to the lowerend gofthe bars 1 are two lateral side bars forining the side supporting unen bers for the screen, these bars inclining downwardly at the required. angle and having theirlower ends supported by ineans yof asuitable meinber A suitable gate 9 is provided for controlling the discharge of thecoke from the bin, which ieoperatedby .any suitable ordesi redineans. a

.Egrtend'ng transversely between the side bars 7 andsecured to the inner surface of thelatterby neans of suitable rivets 10, is

a plurality offsupporting bars 11 niade of I flat steel havingone comparatively small din ension, as shown,fthis dimension being horizontal, the ends ofthese bars being bent at right angles andthe bentportions being secured, asshownybyfthe said rivets, The upper. surfaces of these barstherefore, it willbe noted, are located in different horizontal planes. Supported by each two adjacent barsll is a seriejs ofscreen bars 12. The upper en dof eachfsucli bar is formed with a 'b oss 13 having a vertical rectangula r-section and the lower surfaceof this boss isintersected by slet engaging the up said loolging the direction of thear- 1 per portion of the supporting bar 11, as

' shown in Figj.;3j. The main orbody portion of the bar-extends downwardly and has its unwritten resting freely upon the top of the next lower bar! 11, the upper surface jof the screen harfjbeing inclined as shown. The bars of any given series hence have their lower ends lying laterally adj acentitothe iipper endsof the-barsof the next lower; series,sothatfthebars ofany one series arestaggered laterally with reference *tofthebars of an adjacent series, as shownin bars looking in the direction of the arrow at inFig.3. .55

so: that the upper surfaces of each {series which convergeso as to intersect in a line forming an acute angle with the plane of inclination of the'screen so that these sides may be said to converge downwardly in the direction of incllnatlon and also converge downwardlyin a direction at right angles to said'direction of inclination, as shown in Figs. 4 and 5. This construction, therefore,

produces an arrangement of adjacent screen bars ineach: series" of bars in which the .proXimate surfaces'of such adjacent bars ,may be said to diverge from each other downwardly in the direction of inclination and to diverge from each other 111 a direcftion at right ;ngl esthereto.

The'fseries of bars begin immediately be- -lowthe lower end of the wearing plate and a sufficient number of series are provided to produce the necessary screen surface.

' From the above-described constructlon, 1t

, will be seen that the bars rest loosely upon their supports and may be lifted readily from the latterin an upward direction for .the purpose of removal and replacement.

At the same time, however, when they are I in position, they are securely held against displacement in a downward direction or in ijthe direction of movement of the coke over same aswell as held against lateral displacement; ,This removal may be efiected, as will be readily understood, in a very small space of time, so that a defective bar or fba-rs maybe removed and replaced by new ones, without materially interrupting the screening operation and hence Without any material interruption of the charging operf ,ation.

"By causing the proximate: surfaces of the l bars to vdiverge'in the direction o'finclination, pieces ofcoke which would otherwise tendto clog and stick in the spaces between thebars,.would upon a slight movement "downwardly, reach a' point in which such 4 space has a greater "lateral dimension and would be released and passed through the bars By also having these proximate surfaces diverge in'the direction at right angles to the directiorrof inclination, this same tendency to free pieces of coke tending to dog is present for the same reason, namely,

asthese pieces move downwardly, they reach positions in which the lateral dimension of thespace increases.

By causing the lower end surfaces of the bars to form an acute. angle with the plane The. lower end-surface 15 of each' of inclination, it will be seen that the coke in passing from one step of the cascade to the next, will travel over a maximum of the effective screening surface of the series of bars. The effective screening surface of any given series of bars is all of that part of the space between the bars which is not vertically above the bars of the next lower series, or not occupied by the lower ends of the bars in the next higher series. For instance, the effective part of the spaces of the series of which the fully shown bar in Fig. 3 is a member, is that part included between the planes indicated by dotted lines a2--w and y-y. As much of the remaining surface, therefore, as it is possible to use, should be used. Vere the lower end of the bar of the form heretofore used and shown by the straight dotted lines in connection with the fragmentary portion of the upper bar shown in Fig. 3, it will be seen that the coke would cascade and strike at a point 2, thus rendering ineffective all that portion of the screen spaces above the point z and up to the plane yy. By giving this lower end the inclined form shown, it will be seen that the coke, instead of falling as just described, will describe the curve indicated by the dotted line .2, striking a point a considerably above, thus making effective all that space between the planes e2" and g g which before was not utilized.

The effective screening area, it will thus be seen, is increased as compared with such previous construction.

The acute angle imparted to the lower end surface of the bars is made of such a degree as will cause the coke to strike as high up as possible upon any given series of bars, and will hence be dependent upon the velocity of travel of the coke over the screen.

si-on vertical, they may be so placed as to incline this dimension more or less so long as such inclination is of a degree which will permit the screen bars during the operation to be securely retained by means of the slots or hooks formed in their'upper ends.

. It will also be readily understood by those skilled in the art that the slot may be placed at the bottom of each screen bar and theupper end merely rest upon the upper of the two supporting bars, and that the same result will thereby be obtained as in the described construction, but perhaps by less desirable means.

Having fully described my invention, what I claim and desire to secure by Letters Patent is 1. In a cascade screen for coke or the like, the combination of a frame; a series of crossliars secured to the frame; and a plurality of staggered series of screen-bars loosely mounted on the crossbars, the construction being such that each screen-bar 1s provlded with a clear path for its removal. I

2. In a screen for coke or the like, thecombniation of a frame; a series of cross-bars secured to the frame and arranged to occupy successively lower levels; and a pluralityof series of screen bars loosely mounted on the cross-bars, the same cross-bar supporting the lower ends of one series of screen-bars and i the upper ends of the next lower series of screen-bars. i i y 3. In a screen for coke or the like the com: bination with a support comprising in its structure a plurality of transverse parallel supporting bars having their upper surfaces in different and succeeding horizontal planes; of a plurality of seriesof screen bars, each series comprising a plurality of downwardly extending and laterally adja? cent bars, each of the latter having its upper end engaging one of said supporting bars so as to be upwardly removable therefrom but secured against displacement in the di rection of inclination of the screen and its lower end loosely resting upon the next supporting bar and resting upon a lower supporting ar, the same bar supporting the lower ends of one series of screen-bars and the upper ends of the next lower series of screen-bars. r

5. In a screen for coke or the like, the combination with a plurality of longitudinallyextending side bars, and a plurality of transverse supporting bars formed with angularly bent ends, said ends being secured to side bars; of a plurality of staggered seriesof spaced screen-bars loosely mounted upon said supporting bars, the construction being such that eachscreen-bar is provided with a clear path for its removal.

6. In a cascade screen for coke or the like,

the combination with a plurality of transverse supporting bars placed so as to occupy successive lower levels; of successive series of staggered, overlapping screen bars, each of which has one end provided with a notch intersecting its bottom surface and removably-engaging one of said cross-bars, the opposite end resting upon an adjacent crossbar, theconstruction being such that each screen-bar is provided with a clear path for its removal, the same transverse bar supporting the lower ends of one series of screen-bars and the upper ends of the next lower series of screen-bars.

7. In a cascade screen, the combination with a suitable support including longitudinally disposed members and transversely 1 disposed members supported thereby and occupying successively lower levels; of a plurality of series of screen-bars each removably engaging the tops of said transverse members at their upper ends, whereby they are held against longitudinal displacement,

butremovable in an upward direction, their lower ends resting loosely upon said trans-v verse members, the lower ends of said screenbars being staggered with reference to the upper ends of the next lower series, and the same transverse supporting element being engaged by the upper ends of one series of screendoars and supporting the lower ends of the next upper series.

Signed by me, this 1st day of June, 1916. a ARTHUR G. MoKEE.

Copies of this patent may 'be obtained for five cents each, by addressing the Commissioner of Patents,

v Washington, 11.0." 

